The afternoon session of Formula 1 preseason testing was briefly interrupted Friday when a shuttle bus drove on the track. In a bizarre scene, a red flag was waved to halt testing as a white bus drove slowly on a runoff area of the track at Bahrain International Circuit.

Friday was the final day of Formula 1 pre-season testing but some teething problems at the Bahrain International Circuit caused more than one stoppage in bizarre circumstances

F1 season gets underway this week as Bahrain hosts the official three-day pre-season test for all 10 teams. It is the fifth year running that the Bahrain International Circuit hosts the pre-season test,